Similarly for recession between source and observer there is apparent decrease in source frequency known as RED SHIFT. We see that for relative approach of source and observer apparent or observed frequency increases. It does not depend on either the presence of a force nor on how far light must travel. The SR-Doppler shift is present within the special theory of relativity. I and ii are known as longitudinal Doppler effect and iii is known as transverse Doppler effect as before. Relativistic Doppler shift: The SR-Doppler shift that we discuss in detail in this book is due to relative motion between source and observer. source is in transverse motion wrt observer.
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